Site Report: Dutch Hbr-Unalaska Vly UST 3465
| Site Name: | Dutch Hbr-Unalaska Vly UST 3465 |
|---|---|
| Address: | Building 3465, Ptarmigan Road, Unalaska, AK 99685 |
| File Number: | 2542.38.023 |
| Hazard ID: | 2891 |
| Status: | Cleanup Complete |
| Staff: | No Longer Assigned, 9074655229 dec.icunit@alaska.gov |
| Latitude: | 53.864726 |
| Longitude: | -166.499179 |
| Horizontal Datum: | WGS84 |
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We make every effort to ensure the data presented here is accurate based on the best available information currently on file with DEC. It is therefore subject to change as new information becomes available. We recommend contacting the assigned project staff prior to making decisions based on this information.
Problems/Comments
Diesel fuel contamination from abandoned underground fuel storage tanks, most related to heating fuel. Building 3465 was a former latrine southwest of Building 3360 in the main Ski Bowl valley. The 300 gallon UST-3465 was located just below ground surface. A small stream flows to the southwest approximately 21 feet from the tank. The tank was removed in 1997. No soil was removed. Confirmation sampling indicated DRO remaining up to 2500 mg/kg. Amaknak and Unalaska Islands were used by the military during World War II. The Japanese bombed Dutch Harbor and Fort Mears in 1941. Following the bombing the military dispersed its troops moving back up into Unalaska Valley and Pyramid Valley to minimize the potential for damage if future air raids occurred. The Corps of Engineers had a contractor tear down the abandoned buildings and debris and dispose of them in various landfills during the mid - late 1980s. Underground fuel tanks were abandoned in place. In the mid-1990s the Corps started working on the sites again under the Formerly Used Defense Sites (FUDS) program. Site inspections were done around the former buildings to look for remaining underground fuel tanks and other potential contaminant sources.
Action Information
| Action Date | Action | Description | DEC Staff |
|---|---|---|---|
| 6/5/2000 | Site Characterization Report Approved | DEC received the May 2000 Comprehensive Remedial Investigation Report, prepared by Jacobs Engineering. The report documents removal of this ~300 gal heating oil tank. A small creek is located ~20 feet from the former UST. No contaminated soil was removed from the site. DRO exceeded the method two migration to groundwater cleanup level in two of three samples, the maximum concentration being 2,500 mg/kg. Bedrock was found at ~ 7' bgs. The report recommneds removal of petroleum contaminated soil and consideration of method 3 migration to groundwater soil cleanup levels. | John Halverson |
| 1/23/2003 | Site Added to Database | Unalaska Valley expanded into a total of 26 unique sites from one. | John Halverson |
| 12/8/2003 | GIS Position Updated | TopoZone | Debra Caillouet |
| 6/10/2005 | Update or Other Action | File number issued 2542.38.023. | Aggie Blandford |
| 7/9/2008 | Exposure Tracking Model Ranking | Initial ranking with ETM completed. | Daniel Fremgen |
| 9/14/2010 | CERCLA Proposed Plan | ADEC received the draft final Proposed Plan #7 addressing Unalaska Valley Management Area 11. The plan recommends Alternative 1 (Corrective Action Complete/Cleanup Complete with NDAI) for UST 3465. The source has been removed to the extent practicable, and contamination is less than the calculated Method 3 ACLs. | Meghan Dooley |
| 2/7/2011 | Exposure Tracking Model Ranking | Initial ranking with ETM completed for source area id: 73867 name: UST | Bianca Reece |
| 9/12/2019 | Update or Other Action | Site location was updated on this date. Coordinates for this site are used to determine the presence and position of the site on BLM’s ANCSA Conveyed Land web map. | Rebekah Reams |
| 10/9/2023 | Exposure Tracking Model Ranking | A new updated ranking with ETM has been completed for source area 73867 UST. | Cascade Galasso-Irish |
| 10/16/2023 | Cleanup Complete Determination Issued | On this date, a Cleanup Complete Determination was issued for the Unalaska Valley UST 3465 site. | Cascade Galasso-Irish |
| 2/22/2024 | Document, Report, or Work plan Review - other | On this date, DEC reviewed and approved the redline final, RTCs, and final Restoration Summary Report for the Amaknak Formerly Used Defense Sites F10AK0841-13, -14, -15, -16, -18, -20, Unalaska Valley, Pyramid Valley-Port Levashef, Summer Bay-Humpy Cove, Margaret Bay-Airport, Mount Ballyhoo, and Little South America in Unalaska, Alaska. Of the 53 sites included in this report, 39 of these sites are either closed in the Contaminated Sites database or are not eligible active sites. Fourteen (14) sites remain open in the CS database, either pending further coordination on the pathway to closure or are currently with DEC management for closure decision. This letter is documenting the approval of the final document but does not preclude the need for further investigation of sites included in the report. | Cascade Galasso-Irish |
Contaminant Information
| Name | Level Description | Media | Comments |
|---|---|---|---|
| DRO | Other | Soil | Max concentration of DRO 1,380 mg/kg, below the site-specific ACL of 8,300 mg/kg. |
Control Type
| Type | Details |
|---|---|
| No ICs Required |
Requirements
| Description | Details |
|---|---|
| Advance approval required to transport soil or groundwater off-site. | |
| Movement or use of contaminated material (including on site) in a manner that results in a violation of the water quality standards is prohibited (18 AAC 70) |
No associated sites were found.